* {
  box-sizing: border-box;
}
 
body {
  font-family: Arial;
  background: #f1f1f1;
}
 
    .h4{
        font-family:楷体;
        color: rgb(68, 123, 103);
        background-color: rgb(231, 245, 235);
        padding: 15px;
    }
/* 头部标题 */
.header {
  padding: 5px;
  text-align: center;
  background: white;
    font-family: Segoe, "Segoe UI", "DejaVu Sans", "Trebuchet MS", Verdana, "sans-serif";
}
 
.header h1 {
  font-size: 50px;
}
 
/* 导航条 */
.topnav {
  overflow: hidden;
  background-color: #333;
}
 
/* 导航条链接 */
.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}
 
/* 链接颜色修改 */
.topnav a:hover {
  background-color: #ddd;
  color: black;
}
 

.leftcolumn {   
  float: left;
  width: 75%;
}
 
.rightcolumn {
  float: left;
  width: 25%;
  background-color: #f1f1f1;
  padding-left: 20px;
}
 
/* 图像部分 */
.fakeimg {
  background-color:rgb(231, 245, 235);
    padding:5px;
  width: 100%;
   
            white-space: pre-wrap;
          
            overflow: hidden;
            text-overflow: ellipsis;
        
            font-family: 楷体;
            /* height: 1666px; */
}
.fakeimg p{
  font-family: 楷体;
  font-size: 20px;
}
    .fakeimg1 {
  background-color: #aaa;
    padding:5px;
  width: 100%;
 height: auto;
}
 
/* 文章卡片效果 */
.card {
  background-color: white;
  padding: 20px;
  margin-top: 20px;
    margin: auto;
}
 .card img{
  height: 400px;
  border: 1px solid black;
 }
 .row img{
  border: 1px solid black;
 }
/* 列后面清除浮动 */
.row:after {
  content: "";
  display: table;
  clear: both;
} 
 
/* 底部 */
.footer {
  padding: 20px;
  text-align: center;
  background: #ddd;
  margin-top: 20px;
}
 
/* 响应式布局 - 屏幕尺寸小于 800px 时，两列布局改为上下布局 */
@media screen and (max-width: 800px) {
  .leftcolumn, .rightcolumn {   
    width: 100%;
    padding: 0;
  }
}
 
/* 响应式布局 -屏幕尺寸小于 400px 时，导航等布局改为上下布局 */
@media screen and (max-width: 400px) {
  .topnav a {
    float: none;
    width: 100%;
  }
}
    .bookborder{
        border:2px auto;
    }